| black swallowwort |
USDA PLANTS Symbol: CYLO11 USDA ARS GRIN: 405616 ITIS: 506929 NAPIS: PAMAEBD |
| Cynanchum louiseae Kartesz & Gandhi | |
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Taxonomic Rank: Magnoliopsida: Gentianales: Asclepiadaceae |
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| Synonym(s): Louis' swallow-wort | |
Black swallowwort is an herbaceous, twinning, perennial vine. Leaves are opposite, dark green, oval, shiny, entire, 3-4 in. (7.6-10.2 cm) long and 2-3 in. (5.1-7.6 cm) wide. Flowering occurs in June to July, when dark purple, 5-petaled, star-shaped flowers appear in clusters. Flowers are approximately 0.25 in. (0.6 cm) across and covered with white hairs. Fruit are pods, similar to milkweed pods, which are slender, 2-3 in. (5.1-7.6 cm) long and split to reveal small seeds with tufts of white hair. The hair allows the seeds to be readily dispersed. Plants have rhizomes that sprout new plants. Black swallowwort invades upland areas with a wide range of light and moisture conditions. Black swallowwort is native to Europe and escaped from a botanical garden in Massachusetts. |
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Identification, Biology, Control and Management Resources
- Weeds Gone Wild: Alien Plant Invaders of Natural Areas - Plant Conservation Alliance
- Weed of the Week - USDA Forest Service
- Element Stewardship Abstract - The Nature Conservancy
- Invasive Plant Atlas of New England - University of Connecticut
- Biological Control of Invasive Plants in the Eastern United States - USDA Forest Service
- Plant Invaders of Mid-Atlantic Natural Areas - National Park Service and U.S. Fish and Wildlife Service
| Selected Images from Invasive.org | View All Images at Invasive.org |
 Seedling(s); Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Feature(s); Comparision of flowers of Cynanchum louiseae (top) and Cynanchum rossicum Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Fruit(s); Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Feature(s); Twining vines Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Seed(s); Dehiscing seeds Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Infestation; Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Infestation; Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Diagram or Graphic; Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 36. USDA PLANTS Database, USDA NRCS PLANTS Database, Bugwood.org Additional Resolutions & Image Usage |
Taxonomic References:
- USDA, NRCS. 2001. The PLANTS Database, Version 3.1, National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
Invasive Listing Sources:
- Connecticut Invasive Plant Working Group
- Hoffman, R. & K. Kearns, Eds. 1997. Wisconsin manual of control recommendations for ecologically invasive plants. Wisconsin Dept. Natural Resources, Bureau of Endangered Resources. Madison, Wisconsin. 102pp.
- Invasive Plant Council of New York State
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- New Hampshire Invasive Species Committee. 2005. Guide to Invasive Upland Plant Species in New Hampshire. New Hampshire Department of Agriculture, Markets and Food Plant Industry Division and New Hampshire Invasive Species Committee.
- WeedUS - Database of Plants Invading Natural Areas in the United States
- Connecticut Noxious Weeds
- Massachusetts Noxious Weeds
- Massachusetts Noxious Weeds
- New Hampshire Noxious Weeds
- New Hampshire Noxious Weeds
- Vermont Noxious Weeds
- Vermont Noxious Weeds
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